Avelumab (anti-PD-L1) as first-line switch-maintenance or second-line therapy in patients with advanced gastric or gastroesophageal junction cancer: phase 1b results from the JAVELIN Solid Tumor trial.

ABSTRACT: BACKGROUND:We evaluated the antitumor activity and safety of avelumab, a human anti-PD-L1 IgG1 antibody, as first-line switch-maintenance (1?L-mn) or second-line (2?L) treatment in patients with advanced gastric/gastroesophageal cancer (GC/GEJC) previously treated with chemotherapy. METHODS:In a phase 1b expansion cohort, patients without (1?L-mn) or with (2?L) disease progression following first-line chemotherapy for advanced GC/GEJC received avelumab 10?mg/kg intravenously every 2?weeks. Endpoints included best overall response, progression-free survival (PFS), overall survival (OS), and safety. RESULTS:Overall, 150 patients were enrolled (1?L-mn, n?=?90; 2?L, n?=?60) and median follow-up in the 1?L-mn and 2?L subgroups was 36.0 and 33.7?months, respectively. The confirmed objective response rate was 6.7% in both subgroups (95% CI, 2.5-13.9% and 1.8-16.2%, respectively), including complete responses in 2.2% of the 1?L-mn subgroup (n?=?2). In the 1?L-mn and 2?L subgroups, median duration of response was 21.4?months (95% CI, 4.0-not estimable) and 3.5?months (95% CI, 2.8-8.3) and disease control rates were 56.7 and 28.3%, respectively. Median PFS in the 1?L-mn and 2?L subgroups was 2.8?months (95% CI, 2.3-4.1) and 1.4?months (95% CI, 1.3-1.5), with 6-month PFS rates of 23.0% (95% CI, 14.7-32.4%) and 7.9% (95% CI, 2.6-17.2%), and median OS was 11.1?months (95% CI, 8.9-13.7) and 6.6?months (95% CI, 5.4-9.4), respectively. In the 1?L-mn subgroup, median OS measured from start of 1?L chemotherapy was 18.7?months (95% CI, 15.4-20.6). Across both subgroups, 20.7% had an infusion-related reaction of any grade. Other common treatment-related adverse events (TRAEs) of any grade included fatigue (10.0%) and nausea (6.7%). Treatment-related serious adverse events occurred in 4.0% of patients. Overall, 8.7% had a grade??3 TRAE, including 1 treatment-related death. CONCLUSION:Avelumab showed clinical activity and an acceptable safety profile in patients with GC/GEJC. TRIAL REGISTRATION:ClinicalTrials.gov NCT01772004 ; registered 21 January 2013.

SUBMITTER: Chung HC 

PROVIDER: S-EPMC6362598 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature